package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.properties.JwtProperties;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());

        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 员工注册
     * @param employeeDTO
     */
    @Override
    public void addEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        // 对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);

        // 设置账号状态 默认正常状态为0
        employee.setStatus(StatusConstant.ENABLE);

        // 设置默认密码 默认123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        /**
         * 已经通过切面编程实现
         *
            // 记录当前的创建和修改时间
            employee.setCreateTime(LocalDateTime.now());
            employee.setUpdateTime(LocalDateTime.now());

            // 设置当前记录创建人id和修改人id
            // 通过 进程变量 获取当前登录用户id
            // id 在用户登录时写入到线程变量中 在此处获取
            employee.setCreateUser(BaseContext.getCurrentId());
            employee.setUpdateUser(BaseContext.getCurrentId());
         */

        // 保存到数据库
        employeeMapper.addEmployee(employee);
    }

    /**
     * 员工分页查询
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult getEmployeeByPage(EmployeePageQueryDTO employeePageQueryDTO) {
        // 利用pageHelper分页查询
        // pageHelper底层也是使用ThreadLocal来实现的，所以不需要额外的配置
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page<Employee> page = employeeMapper.getEmployeeByPage(employeePageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 启用禁用员工状态
     * @param id
     * @param status
     */
    @Override
    public void setEmployeeStatus(Long id, Integer status) {
        // 这里封装为Employee对象，因为 EmployeeMapper 中定义的更新方法更加泛用
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
                .build();
        employeeMapper.updateEmployee(employee);
    }

    @Override
    public Employee getEmployeeById(Long id) {
        return employeeMapper.getEmployeeById(id);
    }

    @Override
    public void updateEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        // 对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        // 调用mapper层更新方法
        employeeMapper.updateEmployee(employee);
    }

}
